Sideboard

Teferi, Mage of Zhalfir

Flash (You may play this spell any time you could play an instant.) Creature cards you own that aren't in play have flash. Each opponent can play spells only any time he or she could play a sorcery.

Thoughtseize

Target player reveals his or her hand. You choose a nonland card from it. That player discards that card. You lose 2 life.

Mystical Teachings

Search your library for an instant card or a card with flash, reveal it, and put it into your hand. Then shuffle your library. Flashback {5}{B} (You may play this card from your graveyard for its flashback cost. Then remove it from the game.)

Academy Ruins

Temple of Deceit

Temple of Deceit enters the battlefield tapped. When Temple of Deceit enters the battlefield, scry 1. (Look at the top card of your library. You may put that card on the bottom of your library.) {T}: Add {U} or {B} to your mana pool.

Thassa, God of the Sea

Indestructible As long as your devotion to blue is less than five, Thassa isn't a creature. (Each {U} in the mana costs of permanents you control counts toward your devotion to blue.) At the beginning of your upkeep, scry 1. {1}{U}: Target creature you control can't be blocked this turn.

Master of Waves

Protection from red Elemental creatures you control get +1/+1. When Master of Waves enters the battlefield, put a number of 1/0 blue Elemental creature tokens onto the battlefield equal to your devotion to blue. (Each {U} in the mana costs of permanents you control counts toward your devotion to blue.)

Hero's Downfall

Destroy target creature or planeswalker.

Erebos, God of the Dead

Indestructible As long as your devotion to black is less than five, Erebos isn't a creature. (Each {B} in the mana costs of permanents you control counts toward your devotion to black.) Your opponents can't gain life. {1}{B}, Pay 2 life: Draw a card.

Ashiok, Nightmare Weaver

+2: Exile the top three cards of target opponent's library. -X: Put a creature card with converted mana cost X exiled with Ashiok, Nightmare Weaver onto the battlefield under your control. That creature is a Nightmare in addition to its other types. -10: Exile all cards from all opponents' hands and graveyards.

Reflecting Pool

{T}: Add to your mana pool one mana of any type that any land you control can produce.

Oboro, Palace in the Clouds

Coralhelm Commander

Level up {1} ({1}: Put a level counter on this. Level up only as a sorcery.) LEVEL 2-3 3/3 Flying LEVEL 4+ 4/4 Flying Other Merfolk creatures you control get +1/+1.

Deprive

As an additional cost to cast Deprive, return a land you control to its owner's hand. Counter target spell.

Cyclonic Rift

Return target nonland permanent you don't control to its owner's hand. Overload {6}{U} (You may cast this spell for its overload cost. If you do, change its text by replacing all instances of "target" with "each.")

Dimir Signet

{1}, {T}: Add {U}{B} to your mana pool.

Dimir Cutpurse

Whenever Dimir Cutpurse deals combat damage to a player, that player discards a card and you draw a card.

Dimir Charm

Choose one — Counter target sorcery spell; or destroy target creature with power 2 or less; or look at the top three cards of target player's library, then put one back and the rest into that player's graveyard.

Sword of Light and Shadow

Equipped creature gets +2/+2 and has protection from white and from black. Whenever equipped creature deals combat damage to a player, you gain 3 life and you may return up to one target creature card from your graveyard to your hand. Equip {2}

Go for the Throat

Destroy target nonartifact creature.

Dismember

({B/P} can be paid with either {B} or 2 life.) Target creature gets -5/-5 until end of turn.

Bitterblossom

At the beginning of your upkeep, you lose 1 life and put a 1/1 black Faerie Rogue creature token with flying onto the battlefield.

Sword of Fire and Ice

Equipped creature gets +2/+2 and has protection from red and from blue. Whenever equipped creature deals combat damage to a player, Sword of Fire and Ice deals 2 damage to target creature or player and you draw a card.

Vendilion Clique

Flash Flying When Vendilion Clique enters the battlefield, look at target player's hand. You may choose a nonland card from it. If you do, that player reveals the chosen card, puts it on the bottom of his or her library, then draws a card.

Spellstutter Sprite

Flash Flying When Spellstutter Sprite enters the battlefield, counter target spell with converted mana cost X or less, where X is the number of Faeries you control.

Umezawa's Jitte

Whenever equipped creature deals combat damage, put two charge counters on Umezawa's Jitte. Remove a charge counter from Umezawa's Jitte: Choose one — Equipped creature gets +2/+2 until end of turn; or target creature gets -1/-1 until end of turn; or you gain 2 life. Equip {2}

Cryptic Command

Earwig Squad

Prowl {2}{B} (You may play this for its prowl cost if you dealt combat damage to a player this turn with a Goblin or Rogue.) When Earwig Squad comes into play, if its prowl cost was paid, search target opponent's library for three cards and remove them from the game. Then that player shuffles his or her library.

Mutavault

{T}: Add {1} to your mana pool. {1}: Mutavault becomes a 2/2 creature with all creature types until end of turn. It's still a land.

Bonesplitter

Equipped creature gets +2/+0. Equip {1} ({1}: Attach to target creature you control. Equip only as a sorcery. This card comes into play unattached and stays in play if the creature leaves play.)

Baleful Strix

Urborg, Tomb of Yawgmoth

Each land is a Swamp in addition to its other land types.

Darkwater Catacombs

{1}, {T}: Add {U}{B} to your mana pool.

Cephalid Coliseum

{T}: Add {U} to your mana pool. Cephalid Coliseum deals 1 damage to you. Threshold - {U}, {T}, Sacrifice Cephalid Coliseum: Target player draws three cards, then discards three cards from his or her hand. (Play this ability only if seven or more cards are in your graveyard.)

Sword of War and Peace

Equipped creature gets +2/+2 and has protection from red and from white. Whenever equipped creature deals combat damage to a player, Sword of War and Peace deals damage to that player equal to the number of cards in his or her hand and you gain 1 life for each card in your hand. Equip {2}

Mind Shatter

Target player discards X cards at random.

Glen Elendra Archmage

Flying {U}, Sacrifice Glen Elendra Archmage: Counter target noncreature spell. Persist (When this creature dies, if it had no -1/-1 counters on it, return it to the battlefield under its owner's control with a -1/-1 counter on it.)

Sword of Feast and Famine

Equipped creature gets +2/+2 and has protection from black and from green. Whenever equipped creature deals combat damage to a player, that player discards a card and you untap all lands you control. Equip {2}

Misdirection

You may remove a blue card in your hand from the game instead of paying Misdirection's mana cost. Target spell with a single target targets another target instead.

Harbinger of the Tides

You may cast Harbinger of the Tides as though it had flash if you pay {2} more to cast it. (You may cast it any time you could cast an instant.) When Harbinger of the Tides enters the battlefield, you may return target tapped creature an opponent controls to its owner's hand.

Wydwen, the Biting Gale

Oona's Prowler

Flying Discard a card: Oona's Prowler gets -2/-0 until end of turn. Any player may play this ability.

Urborg

{T}: Add {B} to your mana pool. {T}: Remove first strike ability or swampwalk ability from target creature until end of turn.

Undermine

Counter target spell. That spell's controller loses 3 life.

Snapcaster Mage

Flash When Snapcaster Mage enters the battlefield, target instant or sorcery card in your graveyard gains flashback until end of turn. The flashback cost is equal to its mana cost. (You may cast that card from your graveyard for its flashback cost. Then exile it.)

Invisible Stalker

Nightveil Specter

Flying Whenever Nightveil Specter deals combat damage to a player, that player exiles the top card of his or her library. You may play cards exiled with Nightveil Specter.

Venser, Shaper Savant

Flash (You may play this spell any time you could play an instant.) When Venser, Shaper Savant comes into play, return target spell or permanent to its owner's hand.

Tolaria West

Tolaria West comes into play tapped. {T}: Add {U} to your mana pool. Transmute {1}{U}{U} ({1}{U}{U}, Discard this card: Search your library for a card with converted mana cost 0, reveal it, and put it into your hand. Then shuffle your library. Play only as a sorcery.)

River of Tears

{T}: Add {U} to your mana pool. If you played a land this turn, add {B} to your mana pool instead.

Hymn to Tourach

Target player discards two cards at random.

Boseiju, Who Shelters All

Boseiju, Who Shelters All comes into play tapped. {T}, Pay 2 life: Add {1} to your mana pool. If that mana is spent on an instant or sorcery spell, that spell can't be countered by spells or abilities.

Hatred

Pay X life: Target creature gets +X/+0 until end of turn.

Needle Specter

Flying Wither (This deals damage to creatures in the form of -1/-1 counters.) Whenever Needle Specter deals combat damage to a player, that player discards that many cards.

Countersquall

Counter target noncreature spell. Its controller loses 2 life.

Stratus Dancer

Flying Megamorph {1}{U} (You may cast this card face down as a 2/2 creature for {3}. Turn it face up any time for its megamorph cost and put a +1/+1 counter on it.) When Stratus Dancer is turned face up, counter target instant or sorcery spell.

Watery Grave

Scalding Tarn

Polluted Delta

Marsh Flats

Misty Rainforest

Notion Thief

Flash If an opponent would draw a card except the first one he or she draws in each of his or her draw steps, instead that player skips that draw and you draw a card.

True-Name Nemesis

As True-Name Nemesis enters the battlefield, choose a player. True-Name Nemesis has protection from the chosen player. (This creature can't be blocked, targeted, dealt damage, or enchanted by anything controlled by that player.)

Grand Architect

Other blue creatures you control get +1/+1. {U}: Target artifact creature becomes blue until end of turn. Tap an untapped blue creature you control: Add {2} to your mana pool. Spend this mana only to cast artifact spells or activate abilities of artifacts.

Underground River

Thada Adel, Acquisitor

Islandwalk Whenever Thada Adel, Acquisitor deals combat damage to a player, search that player's library for an artifact card and exile it. Then that player shuffles his or her library. Until end of turn, you may play that card.

Halimar Depths

Halimar Depths enters the battlefield tapped. When Halimar Depths enters the battlefield, look at the top three cards of your library, then put them back in any order. {T}: Add {U} to your mana pool.

Creeping Tar Pit

Creeping Tar Pit enters the battlefield tapped. {T}: Add {U} or {B} to your mana pool. {1}{U}{B}: Until end of turn, Creeping Tar Pit becomes a 3/2 blue and black Elemental creature and is unblockable. It's still a land.